Automobile-tire.



LB. KEMPSHALL.

AUTOMOBILE TIRE.

APPLICATION Plum JULY 2;, 1909.

945,396. Patented Jam 4, 1910.

by Q wt 1 W 1 IVA BELLE 'KEMPSHALL, or, :eos'ro'n, MASSACHUSETTS.

AUTOMOBILE-TIRE.

.Specification 0': Letters Patent.

Patented Jan; 4, 1910;

Application filed July 22, 1909: Serial No; 508,959.

To all whom it may concern:

Beit known that I,- IvA BELLE IEBIP- SHALL','- of Boston,- in the county of Suffolk and, State ,of Massachusetts, have invented certain new and useful Improvements in Automobile-Tires, of which the following is a specification.

Tl1is invention relates to an improvement in automobile tires, and consists in the provision of means-to prevent skidding of the tire,

Figure 1 is'a cross-sectional View of a tire constructed in accordance with my inven tion, showingthe tread surfaces of the tire provided with anti-skidding means. Fig. 2

is a plan view'ot the tread surface of the tire, showing the ant-ieskidding projections on the surface of the tire, their construction and. arrangement with particular reference to the central holding pockets and the side gripping angles formed by the omission'of the pro ections.

The same symbols of reference indicate the same parts in all of the figures.

1 represents an automobile tire of any preferred construction. As here shown, it is formed with parts 2, adapted to be engaged by rims-for binding the tire on the wheel. I have not shown the inner tube nor the wheel, because these parts, as well as the part 2, may beof any well known or pre-- ferred construction and form no part of my invention, which consists in the particular construction of the tread surface 3 of such tires. As will be seen. this tread surface is formed with a plurality of frusto-conical shaped projections 4, Fig. 1 showing some of. the projections in cross section.

' Referring to. Fig. 2,,it will be seen that along the central line of the tread surface the projections 4 are omitted at predetermined points, forming center pockets In like manner the pro ections 4 are omitted at predetermined points on each side of the tread surface, forming side pockets 5, 7, 0pposite each other.

The pro ections 4 extend ina continuous series eircumferentially around the ,tlIQ, and

the width of the series is alternately increase and decreased to 'form the side pockets 6 and -7. The bottoms of said side pockets curve outwardly to the sides of the tire, The projections forming the wlder portions of the series are arranged to surround the central pockets 5, one or more of the projections being omitted, from the center of each of thewider portions.

In the operation of the .tire, not only is skidding resisted by the projections 4 themselves, but said resistance to skidding is greatly increased by reason of the 6, and 7 the action of the pockets 1n connection with the action of the projections holding the tire against skidding action.

Byreason of the fact thatthe portions of the tread or outer surface of the tire which form the bottoms of the pockets 6, 7 curve outwardly and merge into the sides of the tire, the tire is enabled to tip sidewisc in either direction, thus increasing the contact between the bottoms of the side pockets at one side of the series of projectlons with. the track, and enabling the projections which form the margins of said side pockets to engage the track in such manner as'to .reduce the possibility of skidding to the minimum.

While I have shown my invention adapted for use with a wear member of a pneumatic tire, I do not wish to be understood as limiting my invention to a pneumatic tire, as it is equally applicable and intended for use upon all classes of resilient tires, whether solid, pneumatic, cushion, or otherwise.

Having thus explained the nature of my invention and described a way of constructing and using the same, though withoutattempting to set forth all of the forms in which it may be made, or all of the modes of its use, what I claim and desire to secure by Letters Patent is:-

An anti-skidding tire for automobiles, provided with a series of projections ex tending circumferentially around the tread of the tire, the width of the series of projections being alternately increased and diminished to fol-inside pockets 6 and 7 the bot-toms of which curve outwardly and merge .into the sides ofth'e tire, and the projections forming the wider portionsof the series being arranged to forin central pockets 5 alternating with the side pockets. In testimony whereof I have aflixed my signature, in presence of two witnesses.

IVA BELLE KEMPSHALL.

Witnesses:

H. L. Ronnms, P. W. Pnzzm'rr. I

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